Permanent and temporary combined prefabricated diaphragm wall type subway entrance and exit structure

Abstract

The utility model discloses a permanent and temporary combined prefabricated diaphragm wall type subway entrance and exit structure which comprises a structural side wall which is formed by integrating an enclosure structure and a main body structure, and the structural side wall is an assembled prefabricated diaphragm wall. A first temporary steel support for temporary supporting and a second permanent-temporary combination support for permanent-temporary combination are arranged between the prefabricated underground diaphragm walls, a cast-in-place bottom plate is arranged between the prefabricated underground diaphragm walls, and the second permanent-temporary combination support is located at the elevation position of the top plate. The joint of the prefabricated top plate cross beam and the prefabricated diaphragm wall adopts an ultra-high performance concrete cast-in-place joint, so that the physical performance is excellent, the construction workload is reduced, and the construction difficulty is reduced. The scheme that the water stop strip bags and the UHPC concrete wet joints are connected is adopted between the prefabricated diaphragm wall panels, and the waterproof and guiding effects are achieved under the condition that the steel consumption is effectively reduced. The assembly type prefabricated structure of the station entrance and exit structure is high in proportion.

Description

TECHNICAL FIELD

[0001] The utility model belongs to underground structure engineering technical field, concretely relates to a prefabricated ground connected wall type subway entrance and exit structure of permanent and temporary combination. BACKGROUND

[0002] At present, the structure construction of subway station entrance and exit still uses the traditional wet operation, that is, pouring reinforced concrete on site. Not only is the construction period long, the cost is high, the quality guarantee is low, but also it will cause great pollution to the surrounding area. Based on the existing problems of underground structure scheme, constructing a new assembly type underground structure design system is the realistic demand of rail transit engineering construction and high-quality development.

[0003] Therefore, it is necessary to find a more low-carbon, low-cost assembly type subway entrance and exit structure form and construction method to effectively save construction materials such as concrete and steel, and effectively solve the problems of many workers, poor environment and long construction period in the existing construction environment. With the maturity of technology and equipment, the market prospect will be more broad. SUMMARY

[0004] The utility model provides a prefabricated ground connected wall type subway entrance and exit structure of permanent and temporary combination to solve the problems in the prior art.

[0005] The technical scheme of the utility model is: a prefabricated ground connected wall type subway entrance and exit structure of permanent and temporary combination, including the structure side wall of two walls in one of the enclosure structure and the main body structure, the structure side wall is the assembled prefabricated ground connected wall, the first temporary steel support for temporary support and the second permanent and temporary combination support for permanent and temporary combination are arranged between the prefabricated ground connected wall, the cast-in-place bottom plate is also arranged between the prefabricated ground connected wall, and the second permanent and temporary combination support is located at the roof level.

[0006] Further, the second permanent and temporary combination support is also a prefabricated roof beam, and the prefabricated roof beam is part of the structure roof.

[0007] Further, the structure roof comprises the prefabricated roof beam and the prefabricated roof composite board, and the prefabricated roof composite board is connected between adjacent prefabricated roof beams.

[0008] Further, the prefabricated roof beam and the prefabricated roof composite board serve as pouring formworks, and the prefabricated roof beam and the prefabricated roof composite board are provided with cast-in-place composite cast-in-place boards.

[0009] Further, the second permanent and temporary combination support is connected with the prefabricated ground connected wall through super-high concrete.

[0010] Further, the roof composite board and the composite cast-in-place board are arranged in a stepped manner in the climbing section of the subway entrance and exit.

[0011] Further, the reinforced concrete composite cast-in-situ slab is provided with a reinforcing mesh connected with the embedded sleeve at the side wall of the precast diaphragm wall.

[0012] Further, the second permanent and temporary combined support structure is provided with a structure main reinforcement bar protruding from the ends of the structure, and the structure main reinforcement bar is connected with the embedded sleeve at the side wall of the precast diaphragm wall.

[0013] The utility model discloses the beneficial effects are as follows:

[0014] In the utility model, the second permanent and temporary combined support structure is produced in a factory, and the production environment is single, the performance is same, and the quality is controllable. After production, the second permanent and temporary combined support structure is directly transported from the factory to the construction site for installation, thereby effectively reducing the construction period and material waste and improving the construction precision.

[0015] The utility model not only shortens the construction period and reduces the labor quantity, but also almost does not produce construction waste, reduces the construction site area, and reduces the influence on the surrounding residents' production and life.

[0016] In the utility model, the precast roof beam and the precast diaphragm wall joint adopt an ultra-high performance concrete cast-in-situ joint, the physical performance is excellent, and the construction workload and the construction difficulty are reduced.

[0017] In the utility model, the water stop strip capsule + UHPC concrete wet joint connection scheme is adopted between the precast diaphragm walls, under the condition of effectively reducing the steel quantity, the waterproof and guiding effects are achieved. The station entrance and exit structure assembly type precast structure has a high proportion.

[0018] The utility model can effectively reduce carbon emissions and effectively solve many problems in the existing construction conditions. With the maturity of technology and equipment, the market prospect will be more broad. DRAWINGS

[0019] Figure 1 Fig. 1 is a transverse section view of the subway station entrance and exit of the utility model;

[0020] Figure 2 Fig. 2 is a plan view of the subway station entrance and exit of the utility model;

[0021] Figure 3 Fig. 3 is a longitudinal section view of the subway station entrance and exit of the utility model;

[0022] Figure 4 Fig. 4 is a connection schematic view of the precast roof beam and the precast diaphragm wall of the utility model;

[0023] Figure 5 Fig. 5 is a connection schematic view of the cast-in-situ bottom plate and the precast diaphragm wall of the utility model;

[0024] Figure 6Is the utility model prefabricated interconnecting diagram of wall between the width of the wall;

[0025] Figure 7 Is the utility model prefabricated interconnecting diagram of wall between the width of the wall;

[0026] Figure 8 Is the utility model prefabricated interconnecting diagram of wall between the width of the wall;

[0027] Figure 9 Is the utility model prefabricated interconnecting diagram of wall between the width of the wall;

[0028] Figure 10 Is the utility model prefabricated interconnecting diagram of wall between the width of the wall;

[0029] Figure 11 Is the utility model prefabricated interconnecting diagram of wall between the width of the wall;

[0030] Among them:

[0031] 1 prefabricated wall 2 cast-in-place floor

[0032] 3 first temporary steel support 4 second permanent and temporary combined support

[0033] 5 bracket 6 super high concrete

[0034] 7 drilled pile 8 rotary jet pile

[0035] 9 water stop curtain 10 main structure maintenance pile

[0036] 11 main structure side wall 12 entrance cast-in-place side wall

[0037] 13 prefabricated composite plate 14 composite cast-in-place plate

[0038] 15 water stop steel plate 16 grouting pipe

[0039] 17 water-swelling adhesive tape 18 strip bag type sealing gasket

[0040] 19 first embedded angle steel 20 second embedded angle steel

[0041] 21 third embedded angle steel 22 square steel tube

[0042] 23 self-compacting concrete. DETAILED DESCRIPTION

[0043] Below, with reference to the drawings and examples, the utility model is explained in detail:

[0044] As Figures 1 to 11As shown, a prefabricated diaphragm wall subway entrance structure combining temporary and permanent features includes a structural side wall that integrates the enclosure structure and the main structure. The structural side wall is an assembled prefabricated diaphragm wall 1. A first temporary steel support 3 and a second permanent-temporary combined support 4 are provided between the prefabricated diaphragm walls 1 for temporary support. A cast-in-place base slab 2 is also provided between the prefabricated diaphragm walls 1. The second permanent-temporary combined support 4 is located at the top elevation of the slab.

[0045] The second permanent and temporary combined support 4 is also a precast roof slab beam, which is part of the structural roof slab.

[0046] The structural top slab includes precast top slab beams and precast top slab composite slabs 13, with the precast top slab composite slabs 13 connected between adjacent precast top slab beams.

[0047] The precast top slab beams and precast top slab composite slabs 13 serve as casting templates, and cast-in-place composite slabs 14 are installed on the precast top slab beams and precast top slab composite slabs 13.

[0048] The second permanent support 4 is connected to the precast diaphragm wall 1 via ultra-high concrete 6.

[0049] The composite slab 13 and the composite cast-in-place slab 14 are arranged in a stepped manner on the ramp section of the subway entrance.

[0050] The composite cast-in-place slab 14 is provided with a steel mesh, which is connected to the embedded sleeve at the side wall of the precast diaphragm wall 1.

[0051] The main structural reinforcement bars of the second permanent and temporary combined support 4 extend from both ends and are connected to the embedded sleeves at the side wall of the precast diaphragm wall 1.

[0052] Specifically, such as Figure 1 As shown, the second permanent and temporary combined support 4 is connected to the precast diaphragm wall 1 at both ends through ultra-high concrete 6. The second permanent and temporary combined support 4 is located below the first temporary steel support 3. The precast diaphragm wall 1 is provided with a corbel 5 on its side wall, which can support the second permanent and temporary combined support 4.

[0053] Specifically, such as Figure 2 As shown, the precast diaphragm wall 1 is assembled as the main body of the side wall structure. Drilled piles 7 are installed outside the precast diaphragm wall 1 and the cast-in-place side wall 12 at the entrance and exit. Jet grouting piles 8 and main structure maintenance piles 10 are installed outside the drilled piles 7. A water-stop curtain 9 is installed between the jet grouting piles 8 and the main structure maintenance piles 10. The main structure side wall 11 is installed outside the main structure maintenance piles 10.

[0054] Specifically, such as Figure 3As shown, the structure roof plate includes a flat section and a climbing section, in the climbing section, the prefabricated composite slab 13 and the cast-in-situ composite slab 14 are arranged in a stepped manner.

[0055] Specifically, as shown in the figure, Figure 4 As shown, the prefabricated diaphragm wall 1 is provided with a pre-buried sleeve at the position of the top plate elevation, the structure main reinforcement on both sides of the second permanent-temporary combined support 4 protrudes out, the structure main reinforcement is connected with the pre-buried sleeve, and the super-high concrete 6 is poured between the second permanent-temporary combined support 4, the prefabricated diaphragm wall 1, and the corbel 5 to connect them.

[0056] More specifically, the steel mesh in the cast-in-situ composite slab 14 is also connected with the pre-buried sleeve, and then the cast-in-situ composite slab 14 is poured.

[0057] More specifically, the second permanent-temporary combined support 4 forms a concave groove on both sides, thereby ensuring the firmness of the super-high concrete 6 connection.

[0058] Specifically, as shown in the figure, Figure 5 As shown, the prefabricated diaphragm wall 1 is provided with a pre-buried sleeve at the position of the bottom plate elevation, and the steel reinforcement in the cast-in-situ bottom plate 2 is connected with the pre-buried sleeve.

[0059] More specifically, the prefabricated diaphragm wall 1 forms a groove at the position of the bottom plate elevation, and a water stop steel plate 15 is arranged in the groove.

[0060] More specifically, the prefabricated diaphragm wall 1 is provided with two water-swelling adhesive strips 17 at the side wall of the position of the bottom plate elevation.

[0061] More specifically, a grouting pipe 16 for grouting is arranged between the two water-swelling adhesive strips 17.

[0062] Specifically, as shown in the figure, Figure 6 As shown, a sealing gasket groove is arranged between adjacent prefabricated diaphragm walls 1, a strip capsule type sealing gasket 18 is arranged in the sealing gasket groove, and the strip capsule type sealing gasket 18 is two.

[0063] Specifically, two square steel pipes 22 are arranged in one prefabricated diaphragm wall 1, the square steel pipes 22 serve as internal fixed foundations, a first pre-buried angle steel 19 is arranged at the square steel pipes 22, the first pre-buried angle steel 19 is L-shaped, the free ends of the first pre-buried angle steel 19 face each other, the side walls of the first pre-buried angle steel 19 are flush with the side walls of the prefabricated diaphragm wall 1, the side walls of the prefabricated diaphragm wall 1 form a strip-shaped sinking groove, and the two first pre-buried angle steels 19 and the strip-shaped sinking groove form a widthwise clamping groove.

[0064] More specifically, two second embedded angle steels 20 are arranged in the other side prefabricated diaphragm wall 1, the second embedded angle steels 20 are L-shaped, the free ends of the second embedded angle steels 20 are opposite, and the second embedded angle steels 20 project out of the side wall of the prefabricated diaphragm wall 1.

[0065] More specifically, the second embedded angle steel 20 can form interlocking engagement with the first embedded angle steel 19, thereby realizing the connection of adjacent prefabricated diaphragm walls 1.

[0066] More specifically, a dense groove is formed in the strip-shaped sink of the one side prefabricated diaphragm wall 1, and a dense groove is formed at the side wall of the other side prefabricated diaphragm wall 1, the above-mentioned dense grooves correspond to each other, and self-compacting concrete 23 is poured in the dense grooves.

[0067] Specifically, the prefabricated diaphragm wall 1 is provided with a third embedded angle steel 21 at the side wall inside the foundation pit, and the third embedded angle steels 21 of adjacent prefabricated diaphragm walls 1 are welded and fixed.

[0068] Specifically, the prefabricated roof beam serves as the second permanent-temporary combined support 4 during the excavation construction stage of the station entrance foundation pit, and serves as part of the force structure of the roof of the main structure during the use stage, and the prefabricated roof beam and the prefabricated diaphragm wall 1 are connected by UHPC (ultra-high performance concrete) cast-in-place joint.

[0069] Specifically, the prefabricated diaphragm wall and the side wall of the main structure are combined into one, which saves time and cost. The permanent-temporary combined support simplifies the construction steps, reduces material waste, and reduces the cost.

[0070] Specifically, the joint between the prefabricated roof beam and the prefabricated diaphragm wall 1 adopts UHPC (ultra-high performance concrete) cast-in-place joint, which has excellent physical properties and reduces the construction workload and construction difficulty.

[0071] Specifically, the prefabricated diaphragm wall 1 is connected by a water stop strip capsule + UHPC concrete wet joint connection scheme, which effectively reduces the amount of steel used and plays a waterproof and guiding role.

[0072] A construction method of a prefabricated diaphragm wall type subway entrance and exit structure with permanent-temporary combination, comprising the following steps:

[0073] A. Assembling and constructing the prefabricated diaphragm wall 1;

[0074] B. Excavating the foundation pit to below the first temporary steel support 3;

[0075] C. Installing the first temporary steel support 3;

[0076] D. Excavating the foundation pit to below the second permanent-temporary combined support 4;

[0077] E. Installing the second permanent-temporary combined support 4;

[0078] F. Excavate to the bottom of the pit, construct the foundation layer, and then construct the cast-in-place base slab 2;

[0079] G. Construction structure top slab;

[0080] H. Backfill the top slab with soil and remove the upper segment of the precast diaphragm wall 1;

[0081] I. Backfill the remaining soil and restore the road surface.

[0082] Specifically, step A involves assembling the precast diaphragm wall 1, and the specific process is as follows:

[0083] The trough was constructed using mud slurry for wall protection, with the Z-shaped section of the civil defense section as the first section, and the prefabricated diaphragm wall 1 was assembled on both sides of the entrance and exit.

[0084] Specifically, step E involves installing the second permanent support 4, and the specific process is as follows:

[0085] First, the second permanent and temporary combined support 4 uses precast concrete beams, which will later serve as the top slab of the station entrance and exit structure.

[0086] Then, the second permanent and temporary combined support 4 is placed on the side wall of the precast diaphragm wall 1, and the steel bars are connected through the pre-embedded sleeves embedded in the precast diaphragm wall 1.

[0087] Finally, UHPC concrete is used to fill the gap between the precast diaphragm wall 1 and the second permanent and temporary support 4, and the lateral spacing of the support matches the width of the precast diaphragm wall 1.

[0088] Specifically, in step F, the foundation layer is excavated to the bottom of the pit, and the cast-in-place base slab 2 is constructed. The specific process is as follows:

[0089] Excavate to the bottom of the pit to construct the foundation layer, and then cast the bottom slab 2 in place. The reinforcing bars are connected by the pre-embedded sleeves on the precast diaphragm wall 1.

[0090] Specifically, step G involves constructing the top slab of the structure, and the specific process is as follows:

[0091] First, assemble the top panel composite slab 13;

[0092] Then, the composite cast-in-place slab 14 on the top slab composite slab 13 is constructed;

[0093] Finally, waterproof the roof slab.

[0094] Specifically, step H involves backfilling the top slab with soil and removing the upper segment of the precast diaphragm wall 1. The specific process is as follows:

[0095] Backfill the top slab with soil, remove the upper segment of the precast diaphragm wall 1, and treat the waterproof seal between the vertical joints above the middle segment of the precast wall.

[0096] The second permanent and temporary combined support in the utility model is produced in a factory, and the production environment is single, the performance is same, and the quality is controllable. After production is completed, the factory directly transports to the construction site for installation, effectively reduces the construction period and material waste, and improves the construction precision.

[0097] The utility model not only can shorten the construction period and reduce the labor quantity, but also almost does not produce the construction waste, reduces the construction site area, and reduces the influence on the surrounding residents' production and life.

[0098] The prefabricated roof beam and the prefabricated ground wall joint in the utility model adopt an ultra-high performance concrete cast-in-place joint, the physical performance is excellent, and the construction workload is reduced, and the construction difficulty is reduced.

[0099] The utility model adopts a water stop strip capsule+UHPC concrete wet joint connection scheme between the prefabricated ground walls, plays a waterproof and guiding role under the condition of effectively reducing the steel consumption, and the station entrance structure assembly type prefabricated structure proportion is higher.

[0100] The utility model can effectively reduce carbon emissions, and can effectively solve many problems in the existing construction conditions. With the maturity of technology and equipment, the market prospect will be more broad.

Claims

1. A permanent temporary combined precast diaphragm wall type subway portal structure comprising a structure side wall in which a retaining structure and a main structure are combined, characterized in that: The structure side wall is a prefabricated diaphragm wall (1), a first temporary steel support (3) for temporary support and a second permanent-temporary combined support (4) for permanent-temporary combination are arranged between the prefabricated diaphragm walls (1), and a cast-in-place bottom plate (2) is arranged between the prefabricated diaphragm walls (1), and the second permanent-temporary combined support (4) is located at the top plate elevation.

2. The permanent temporary combined precast diaphragm wall type subway portal structure according to claim 1, characterized in that: The second permanent-temporary combined support (4) is also a prefabricated top plate beam, and the prefabricated top plate beam is part of a structure top plate.

3. The permanent temporary combined precast diaphragm wall type subway portal structure according to claim 2, characterized in that: The structure top plate comprises prefabricated top plate beams and prefabricated top plate composite slabs (13), and the prefabricated top plate composite slabs (13) are connected between adjacent prefabricated top plate beams.

4. The permanent temporary combined precast diaphragm wall type subway portal structure according to claim 3, characterized in that: The prefabricated top plate beams and the prefabricated top plate composite slabs (13) serve as pouring forms, and the prefabricated top plate beams and the prefabricated top plate composite slabs (13) are provided with cast-in-place composite cast-in-place slabs (14).

5. The permanent temporary combined precast diaphragm wall type subway portal structure according to claim 3, characterized in that: The second permanent-temporary combined support (4) is connected to the prefabricated diaphragm wall (1) through super-high concrete (6).

6. The permanent temporary combined precast diaphragm wall type subway portal structure according to claim 4, characterized in that: The top plate composite slabs (13) and the composite cast-in-place slabs (14) are arranged in a stepped manner in the ramp-up section of the subway entrance and exit.

7. The permanent temporary combined precast diaphragm wall type subway portal structure according to claim 6, characterized in that: The composite cast-in-place slabs (14) are provided with a steel mesh, and the steel mesh is connected to a pre-buried sleeve at the side wall of the prefabricated diaphragm wall (1).

8. The permanent temporary combined precast diaphragm wall type subway portal structure according to claim 1, characterized in that: The second permanent-temporary combined support (4) is provided with structure main reinforcement at both ends, and the structure main reinforcement is connected to the pre-buried sleeve at the side wall of the prefabricated diaphragm wall (1).

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